I'm not sure if this is what you're looking for, Mike, but a search for Roman decadence summoned this (I don't know if it's public domain)....
http://hoocher.com/Thomas_Couture/Thomas_Couture.htm
Copy/pasted info:
Thomas Couture (1815-1879)
Romans during the Decadence
1847
Oil on canvas
H. 472; W. 772 cm
Paris, Musée d'Orsay